Telephone control system



June 15, 1937. MYERS TELEPHONE CONTROL SYSTEM Filed March 11, 1956 I5 SheetsSheet l kmk v4 Put wzhk HIH lllll /NVENTOR 0. MYERS ATTORNEY 0. MYERS June 15, 1937.

TELEPHONE CONTROL SYSTEM Filed March 11, 1956 5 Sheeis$heet 2 mm LR Fuk 2 x HE lNl/ENTOR 0- MYERS ATTORNEY June 15, 1937. I

O. MYERS TELEPHONE CONTROL SYSTEM Filed March 11, 1956 5 SheetseSheet 5 INVENTOR I 0. MYERS GPM A TTORNEY Patented June 15, 1937 UNITED STATES PATIENT OFFICE TELEPHONE CONTROL SYSTEM Application March 11, 1936, Serial No. 68,258

7 Claims.

This invention relates to telephone systems and has for its object to simplify the identification of classes of subscribers lines.

More specifically, lines may be classed as individual lines, whether serving one or more subsistance which differentiates them from individual lines and which alters the busy condition on the test terminal to cause the switch to ad- Vance in search of an idle line. In the case of non-progressive switches, for example, crossbar switches as shown in the application of W. W. Carpenter, Serial No. 27,305, filed June 19, 1935, the lines and trunks are tested in groups by means of a marker and the switches are operated only if an idle trunk is available. In this application each individual line is provided with a single test lead extending toward the marker, while each trunk of a private branch exchange group with exception of the last is provided with two test leads extending toward the marker. The marker is equipped with two relays for each line of a group to be tested, one of which operates when connected to the test lead of a busy line 30 and both of which operate when connected to the test leads of a busy intermediate private branch exchange trunk. When a line or trunk is found idle. the switching equipment is rendered effective to complete the connection. The 35 location of the called line and therefore the identity of the switching equipment to be used is determined from the line designation.

As a later development of the cross-bar telephone system, the same switches give access to 40 the lines both when originating and receiving calls, the lines being arranged in accordance with their calling rate to give as uniform a load as possible. Therefore, the location of a called line is not fixed and the line testing equipment must 45 tell the marker the location of the line as well as its nature and condition.

In accordance with the present invention, each line has only a single test lead. For each physical group of lines a relay having a plurality of 5b windings is provided, and for each numerical group of lines a multi-contact relay is provided, the contacts of these second relays being crossconnected to the windings of the first group of relays in accordance with the nature of the lines, 55 thereby providing a simultaneous indication of the type, condition and location of a wanted line.

A complete system in which the present invention is employed is disclosed in the application of W. W. Carpenter,'Seria1 No. 68,262, filed March 11, 1936. 5

The invention will be more clearly understood from a consideration of the accompanying description of the drawings in which:

Figs. 1 and 3 show portions of a terminating marker;

Fig. 2 shows in fragmentary form the distributing frames and line choice connecter; and

Fig. 4 shows the manner in which Figs. 1 to 3 should be arranged.

Briefly, the establishment of a connection at 15 a terminating office is as follows: The seizure of junctor incoming to the terminating ofiice is followed by the association therewith of a terminating sender. The completion of the association transmits a signal to the originating send- 20 er which thereupon transfers the line designation to the terminating sender. When the designation has been received the terminating sender summons a terminating marker and records the designation therein. 25

The marker in response to this registration seizes the line choice within which the line lies and tests the line. From the line choice connecter it receives an indication of the location and nature of the wanted line, after which it transmits a signal to the incoming junctor of the ringing current to be used, tests for an idle channel interconnecting the incoming junctor and wanted line, operates the proper switch mag nets, tests the connection, transfers control to the incoming junctor and releases.

Referring to the drawings, the designation of .a wanted line is recorded on the thousands, hundreds, tens and units registers by the sender. The lines are arranged numerically in groups of 40 twenty, determined jointly by the thousands, hundreds and tens registers. To this end the thousands reglster may ground any one of ten leads corresponding to the ten thousands digits. The hundreds register operates relay I00 for digits from 0 to 4 and relay lill for digits from 5 to 9. The leads from the thousands register are carried in multiple over the contacts of relays I00 and I0! so that the thousands and hundreds registers jointly control a group of twenty relays which identify numerical groups of five hundred lines, and of which relay'llIB is one. As will appear, this relay must control so many contacts that actually a plurality of multipled relays would be used.

The hundreds register also operates one of live relays, such as relays 194-, I95 etc. corresponding to the particular hundred in the flve hundred group. For example, relay I would be operated whether the recorded digit were 0 or 5.

The tens register also operates one in each of two sets of relays, but it operates relay I96 for even digits and relay I I! for odd digits while it operates one of the flve relays I99, I99, etc. to

locate the digit in the odd or even group. For example, relay-108 identifies the first digit in either group and therefore is operated for either the digit 0 or the digit 1.

A set of three circuits is controlled by these register operated relays. These three circuits extend in multiple to the five tens relays I08, I09, etc., each of the five multiples of the circuits are againmultipled before the five hundreds relays Hll, I 05, etc., and each of these twenty-five multiples are in turn multipled before the twenty relays like relay I. This results in five hundred sets of three terminals at a distributing rack, such as rack ill. However, with one relay in each group operated, only one set of terminals will be marked as a result of the registration and translation of any number. For example, with relays I I8, I94 and I93 operated only the set of three terminals 2, H3, and I will be marked.

Physically the lines of an office are arranged in groups of ten which are served by an individual cross-bar switch. The individual switches are arranged in ten levels making up a frame and four frames make up a group called for convenience a choice. According to the amount of traffic, from one to seven switches may be multipled together in one level so that a frame may serve from one hundred to seven hundred lines and a choice may include four hundred to twenty-eight hundred lines.

Each line choice is connected with each marker by means of a line choice connecter and when a set of terminals on rack III is marked, battery connected to terminal III, for example, operates relay H5 which is individual to the marker in the line choice connecter serving the line choice which includes the wanted line. A lock-out arrangement, not shown, permits connection of the choice toonly one marker at a time and multi- -contact relays such as relay 29; make the necessary connections between the marker and connecter. With the line choice seized, ground con nected to terminal 3 operates hundred-block relay illi which is individual to a group of one hundred lines, while'ground through relay llll connected 'to terminal I operates twenty-block relay lover a contact of relay 6 to pick the group of twenty lines of whichthe wanted line is one. This group isconsecutively numbered but the five twenty-blocks connected to a given hundred-block relay need not be consecutive. There are as many hundred-block and twentyblock relays as are necess ry for the number'of lines in the choice. 7

Twenty-block relay Ill controls two sets of twenty armatures, one set cross-connected to the sleeve terminals of the twenty lines and the other set connected to windings of level relays.

In Fig. 2 have been indicated thirteen lines, namely, the first and tenth line (line 0 and line 9) in level No. 9, and one line each in levels No. 5 and No. 0-of frame No. 0 as well as one line each in levels No. 0, No. 5 and No. 9 in frames No. i, No. 2 and No. 3. Corresponding to these levels there-are forty level relays in the line choice conof the corresponding level side of the windings oi the level relays of a frame operates.

necter, one for each'of the ten levels of the four frames. Of these, twelve have been shown corresponding to the levels of the lines shown.

Each level relay has three windings and these windings terminate at one side in cross connecting terminals. To these terminals are connected the lower set of armatures of the twenty block relay H1 and similar relays, in'accordance with the nature of the line connected to the corresponding armature of the upper set.

vThe connections for three lines have been shown, namely, line 9 in level No. 9 of frame No. 0, a line in level No. 0 of frame No. 0 and a line in level No. 5 of frame No. 1. For convenience, assume that the first of these lines is an intermediate line in a terminal hunting group, the

. second the last line of such a group and the third a party line requiring ringing over the tip conductor. Therefore, the corresponding inner armature contacts of relay ill will be connected to the sleeve terminals of these lines, while the lower armature contacts will be connected respectively to the left, middle and right windings relays. The opposite are multipled together and connected back to the marker. That is, all oi the left windings of the level relays of the No. 0 frame are connected to the outer upper armature of relay "I, the middle windings to relay 392 and the right windings to relay 393. Relays 392 and 393 are connected to the No. 0 frame of a choice, relays I and 305 to the No. 1 frame, etc.

When the marker is ready to test the wanted line, relay I is operated. The marker connects battery through relay 9, through the windings of twenty test relays ill to 329, over the left back contacts of relays 399 to 349 respectively, over contacts of relay 293 to the-twenty inner armatures of relay II! and the sleeve terminals of the twenty lines including the wanted line which may be located anywhere within the choice.

The test relays corresponding to busy lines operate.

' At the same time battery through a set of relays 359 to 369 is connected over the light back contacts of relays 339 to 349 respectively, over the lower set of armatures of relay ll'l jtothe windings of corresponding level relays. The circuit of relay 359 which is connected over the inner armature ofthe lower set to the left winding of level relay 2 extends to ground over the outer upperv front contact of relay Ill, and relay Ill Similar circuits are closed for the other relays of the group 359 to 399 which are connected by relay III to left windings of level relays. Therefore all relays of group ii. to 329 which are connected to busy lines operate. and all relays of group 350 to 369 which are connected to armatures of relay I I 1 corresponding to private branch exchange lines are operated irrespective of the individual identity of the wanted line. After an interval, ground is connected through the units register and over the odd or even tens relay to the armature of the test relay corresponding to the wanted line.

For an idle line whether individual or one of a group,the corresponding relay of the group 330 to 349 is operated. For a busy individual line a busy back relay (not shown) is operated. I'br busy lines of a group, relays m to I29 and I" to I69 cooperate to extend the circuit to the relay of the group 330 to 349 corresponding to the first idle line, or if no line is idle to the busy back relay.

With one of the relays 330 to 349, for example relay 330, operated, relay 30l is released and ground is connected over the right front contact of relay 330, contacts of relays 203 and H1, left winding of relay 2M, contact of relay 203, outer upper back contact of relay 30 I, winding of relay 302 and battery. Relay 302 controls the ringing control relays to signal the junctor to ring over the ring conductor and tells the marker that the wanted line is located on frame No. 0. Relay 204 completes the identification of the level by operating a relay in the line group circuit (not shown). I

Line 20l was taken as an example of an individual line or the last line of a terminal hunting group. In this case, with relay 340 normal, the circuit of relay 360 extends over the back contact of relay 340 and contacts of relays 203 and II! to the middle winding of relay 205, contact of relay 203, directly to the winding of relay 302 and battery. Therefore, neither relay 330 nor relay 302 is operated at this time. Relay 360 normal prevents terminal hunting. When relay 340 substitutes ground for relay 330, relay 302 operates to set ringing and inform the marker that the line is located on frame No. 0.

Line 202 was assumed to be a party line requiring ringing over the tip conductor. When relay 349 operates, assuming the line to be idle, it connects ground over contacts of relays 203 and II! to the right winding of relay 203 and the winding of relay 305. Relay 305 operates a relay which signals the incoming junctor to apply ringing current to the tip conductor and also informs the marker that the line is located on frame No. 1.

This arrangement also provides a simple means of dealing with unequipped lines. If a line number is unused, the corresponding terminals of the proper twenty-block relay are left disconnected. Therefore, the test relay cannot operate and when the corresponding relay in group 330 to 349 operates, no circuit is closed for a level relay or for a relay such as relay 302, 303, etc. After an interval following the release of relay 30!, a circuit is closed over the back contacts of all of the frame indicating relays 302, 303, 304, etc. which causes the transfer of the call to an intercepting operators position.

The details of several of the above-mentioned functions have not been given since they have been covered in the Carpenter application, Serial No. 68,262.

A study of the drawings and description will show that with this arrangement the lines may be arranged with great flexibility.

The lines bearing a group of twenty consecutive numbers, may be scattered anywhere within a choice, that is anywhere in the ten levels of each of four frames. The entire group may be moved from one choice to another without altering the numbering by changing the cross connection inthe upper section of rack l I I. Alteration of the cross connections in the middle and lower sections may or may not be necessary. If, for traffic reasons, it is desired to change the location of a line within a choice, the number need not be'changed, but the sleeve and level leads merely moved in accordance with the new location.

If an entire group of five hundred numbers is not used, the corresponding relay such as relay I03 would be omitted and the lead grounded by the registers connected to a blank number relay. If a group of twenty numbers is omitted, the

terminal in the middle section of rack I II is connected to the blank number relay instead of to the line choice connecter and the connections to the other sections omitted. As pointed out above, the use of a single number may be discontinued by omitting the connections between the contacts of the twenty-block relay and the line sleeve and the level relay.

What is claimed is: v 1. In a telephone system, subscribers lines of a plurality of types, the numerical and physical groupings of said telephone lines not being the same, numerical group relays having a set of contacts for each line, physical group relays havin a winding for each type of line, and means to cross connect the contacts of said numerical group relays and windings of said physical group relays to give a simultaneous indication of the type, and location of a line under test.

2. In a telephone system, subscribers lines of a plurality of types, the numerical and physical groupings of said telephone lines not being the same, numerical group relays having a set of contacts for each line, physical group relays having a winding for each type of line, and means to cross connect the contacts of said numerical group relays and windings of said physical group relays to give a simultaneous indication of the type, condition and location of a line under test.

3. Ina telephone system, party linesrequiring special ringing, private branch exchange trunks requiring special testing, said lines being arranged in physical groups independent and differing from their numerical grouping, a relay for each physical group, a relay for each numerical group having a contact for each line in the group control means, and means to cross connect said numerical group relay contact and said physical group relays to indicate to said control means the requirement for special test or for special ringing in accordance with the nature of the line to which said contact is individual.

4. In a telephone system, automatic switches, subscribers lines having numerical designations, said lines being of a plurality of types and appearing in said switches, the physical grouping of said lines in said switches being independent of said designations, means including a multicontact relay for selecting a numerical group of lines for test, a relay for each physical group of lines each having a plurality of windings, means for cross connecting contacts of said numerical group relays individual to the lines of the group with one or another winding of said physical group relays in accordance with the type of line, means controlled over said cross connections to indicate the type and location of a line under test, and means under the control of said indicating means to operate said switches to connect with said line.

5. In a telephone system, automatic switches, subscribers lines having numerical designations, said lines being of a plurality of types and appear- ,ing in said switches, the physical grouping of said lines in said switches being independent of said designations, control means including a multi-contact relay for selecting a numerical group of lines for test, a relay for each physical group of lines each ings, means for cross connecting contacts of said numerical group relays individual to the lines of the group with one or another winding of said physical group relays in accordance with the type of line, means controlled over said cross connections to indicate the type and location of having a plurality of winda line under test, means under the control of said indicating means to operate said switches to connect with said line, and means effective if the cross connections of a line are omitted to 5 indicate to said control means that the line number is unused.

6. In a telephone system, automatic switches,

subscribers lines to be treated as individual lines,

private branch exchange trunks requiring spe- 10 cial testing, and lines requiring special ringing,

l5 tact relays associable with said control means having a contact for each line in numerical groups diflering from said physical groups, means to cross connect said contacts to windings of said physical group relays in accordance with the 10- 20 cation and nature of said lines, numerical means for selecting one of said contacts, and means in said control means operated over said contact and cross connection to indicate the location of the corresponding line.

7. In a telephone system, automatic switches,

subscribers lines to be treated as individual lines, private branch exchange t requiring special testing, and lines requiring special ringing, said lines appearing in said switches in physical groups, a multi-winding relay for 'each of said physical groups, control means for testing said line and controlling said switches, multi-contact relays associable with said control means having a contact for each line in numerical groups diiiering from said physical groups, means to cross connect said contacts to windings oi said physical group relays in accordance with the location and nature of said lines, numerical means for selecting one of said contacts, and means in said control means operated over said contact and cross connection to indicate the location of the corresponding line ii said line is an individual line, and means in said control means operated over said contact and cross connection it said line is a private branch exchange trunk to render the operation of said indicating means dependent on the first idle trunk.

OSCAR MYERS. 

